A protective flap or covering that moves over the eye, like an eyelid or a flap on a mask or piece of armor.
From 'eye' + 'flap' (Old Norse flappa, meaning something that moves loosely). Compound formed to describe any hinged protection for the eye.
Medieval knights wore helmets with eyeflaps that could close to protect their eyes in battle—the design was copied from how animals like owls have protective membranes that slide across their eyes.
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